Wash-over hydraulic wall hook



April 14, 1931. c. P. YOUNG WASHOVER HYDRAULIC WALL HOOK Filed Nov. G, 1929 2 sheets-sheet 1 l w V April 14, 1931. c. P. YOUNG 1,800,490

* wAsHovER HYDRAULIC WALL Hoox Filed Nov. e. 1929 2 sheets-sheet 2 Patented Apr. i4, 1931 f' wardly into a well and recate@ r' MONETA, CALIFORNIA vVVASI'LOTER HYDRAULIC WALL HOOK Application nied'novemter e, 1929. sensi No. 405,259.

My invention isV a washer hydraulic wall hook for use' in well drilling, to engage a drill pipe or the like which has become lodged in the well and shifted to'one side due to a cave-in or the'like. y I

An objectof myinvention isin one fea ture the construction of a wallhoolrattached to' a string of pipe, which may be forced laterally by the slushing fluid pumped downforced laterally on rotation ofthe pipe, it may grip a string of drill pipe dislodged to one side on the hole'due to a cavein or other cavity in the side of the hole.

Another feature of my invention in connectionwith they positive ylateral shifting of the Lwall hook, is a means for exerting substantially 'the full pressure of the slushing fluid to shift the wall hook and hold it shiftdone 'by means of a loose plug Afoi'niing'a closure for'the lower end of `the string of pipe. `.This plug therefore causes the pressure tobe exertedA onV a small piston Connectedto theupper'vpart of the wall hook and operating` in a shortk pressure chamber. rilhe wall hook isv pivotedl so that the small piston is formedarcuate as is the pressure chamber'in which it operates'.

Another object of my invention is a construction by which after the string of drill pipe having the bit vat the lower end has ybeen' straightened'into a vertical position, it may be forced upwardly into the pipe carrying the wall hook.' T he plugwhich is located inthe lower end of the pipef and forms the closure against tlie'hydraulic fluid is ele vated while the string of drill pipe vpasses upwar'dly'into the pip-e carrying the ywall hook as such pipe is lowered into the well, and in this'ope'ration the hydraulic slushing of the vwell may be carried on. 1 e f f My; invention is illustrated inthe paccompanying'drawings, in which, y 'Y Figrl is'a side elevation of my invention showing the wall' hook engaging a string of drill/pipe'lodgedto one side ofthe hole;

-FiglfQis a vie'w similar to Fig. l, illustratingfthefrpip'e straightened' into a vertical position; fv Y y Y v Eig/.f3 is a-,viewsimila'r Ato Fig; Q-,with the wall when such hook is meral 15, having a drilling f hook shown -in pipe carryingthel wall hook andv part of the hook shownin section; i v Fig.' 4 is a vertical section substantially kon the line 4-4 of Fig.` 2, in the directionof the arrows; v I .5

Fig.- 5 risa side elevationin `the direction of the arrow 5 of Fig. 4, partly broken away, Fig. 6 ris a viewfsimilarto Fig. 5, showing` the wall hoolrdisplaced to one side; o Fig. 7 is a section of the wall hook on the line'7-7 of Fig. 4, taken in the direction of the arrows; l v

Fig. 8'is ahorizontal section on-the line 8-8 of FiOJl; f i Fig. 9 is a detail enlarged view ofthesupporting springs for the plug of Fig. 4C.y

In the drawings, the vwell casing isindif cated by the numeral 11, having` the well hole l2 extending below the casing; thebottom; of the hole being "indicated atl?) and the cavein or other cavity' ll at the side.V AlOTOlien string of drill pipe is indicated byy the-nuybit 16 at thebottom. "This is the @fish Ato be removed from the well asit first has to be engaged and centeredby a wall hook. AAfter straightening this string of drill' pipe linto ya vertical line, -which is the function of the present apparatus,'the 'stringr may be cutby .a tool lowered into thewell and then removed in f'f sections o'rthe ldrill bit forced to 'one side of the hole. The wall hook and other features of this invention may be considered 'as a further developmentof the Ahydraulic'wall wall hook is pivoted tothe sub-by pivot screws 22`.f The sub has an upper 4anda lowerfarcuate slot 23 and QAjand the wall hookl is provided with pins 25 whichengaige inythese slots, forminga stop for the removal'ofv the wall hook..` A 'lateral pressure chamber? 2Gf"is the patent tofGatesve'tal., '5'

formed in the back of the sub, this beingl illustrated as square in vertical section and in this V lits the piston'27 formed integral with the upper back portion 28 of the wall hook. The sub is provided with an upper arcuate slot 29 in which fits an arcuate projection 30 on the upper part of the wall hook. The lower part of the wall .hook is somewhat U-shaped in cross section as indicated at 31 (note Figs. 4, 5 and 7) and has an encircling hook 32 at the bottom, the lower face 3370iZ this hook having a roughened cutting surface.Y

The sub terminates at the bottom on the line'indicated at 34 and has a slight upward slope 35 at the front to accommodate the tilted wall hook. The wall hook is provided with a flared skirt 36 having a reaming edge 37. Located in the bottom of thesub there is ashiftable circular plug 38, this plug being supported adjacent its periphery by spring brackets 39. These spring brackets have their lower end 40 secured to the lower part .of the wall of the sub and have horizontal flanges 41 adapted to recede into recesses 42 as hereinunder set forth. These springs support the plug and prevent its downward movement. The plug is provided with a central slushing duct 43 to allow downward flow of the slushing mud. This however, is restricted in size so that the pressure may be increased in the pipe V17 by increasing the pressure of the pumps.

Y `When a string of drill pipe has been lodged Vat one side of the well as indicated in Fig. 1, a larger stringV 17 with the wall hook is lowered into the well. When this is at the proper depth to engage the broken string 15, an increased pressure is exerted by themud pumps, which on account of the small opening through the plug 38 gives a considerable pressure against the piston 27 of the wall hook and thus forces `the wall hook to one Vside as indicated in Fig. 1. The Astop pins 2 5 operating in the slots 23 and 24 form a limit to the lateral movement of the hook. The string 17 is then rotated unt-il the hook has engaged the string; the pressure may then be released and the string 17 rotated until the wall hook assumes the position in alignment with the larger string 17 and the broken string 15 is brought into a vertical position. The string 17 is then lowered, the

upper end of the broken string 15 being forced upwardly through the upper vpart of the wall hookand-engaging theplug 38 lifting this plug Vupwardly into the larger drill pipe 17 'as indicated in Fig. 3.

The string 17 with its wall hook is then lowered until a desirable location for cutting the string 15 is'arrived at, then the cutting tool (which forms no part of this immediate Y invention) is lowered over the'drillst'ring 17 and over the wall hook engaging the Vbroken string 15 above the bit and'cutting the string. The string 17 with its wall hook may then said structure. said in the operation of the wall hook; the reamer 36 having the reaming edge 37 may be brought into operation, cutting the side formation of the hole when the wall hook is inclined to one side. It will be seen by the present invention that considerable pressure may be exerted to thrust the wall hook to one side, this action being by the pressure of the slushing Huid and at the same time a circulation in the well may be maintained.

' Various changes may be made in the principles of my invention without departing from the spirit thereof as set forth in the description, drawings and claims.

I claim:

1. In a device as described, a tubular supporting structure connectible to a string of pipe, a partial closure for the-lower end of l n structure having a pressure chamber therein, a'wall hook pivotally connected to the structure and having a piston operating in the said pressure chamber, whereby a hydraulic fluid may tilt the wall hook laterally, the saidpartial closure means being adapted to shiftwhen engaged by an article caught by the wall hooki 2. In a device as described, a tubular supporting structure adapted for connection to a string of pipe, a plug having an opening in ithe* bottom of said structure, a wall hook connected to the structure, meansto hydraulically operate the wall hook to shift same laterally to engage an article inthe wall, the said plug being shiftable by said article when brought into alignment with the string of pipe.

3. A device as described, comprising a string of pipe having a tubular structure at the bottom with a rshift-able closure plug loosely retained at the bottom, a wall hook pivotally connected to the structure, ahydraulically operated means to shift the wall hook laterally, said hook lhavingV means to engage an article in the well and to bring such article into alignment withthe pipe, the said plug .being shiftablc upwardly on lowering of the pipe and the wall hook relative to the said article. Y 4. A. device as described, comprising a string of drill pipe having a tubular structherein with a resilient supporting means for the plug, a wall hook pivotally connected to the structure, hydraulically operated means to shift the wall hook, whereby-the lower end may Vengage an article in the well. said article when Vin alignment with vthe string of pipe and on lowering of such string, and the wall hook being adapted-to shiftthe plug upwardly in the `said'tubular structure.

5. A device as claimed in claim 4, the resiliu, rectly to a hydraulic pressure in the said tupressure'chamber.

ent support 'comprising springs secured to edge and adapted to form a reamer when the the lower portion of the tubular structure, hook is tilted. Y with means to allow partial pressing of said l2. A device as described, comprising ay springs outwardly on the movement of an string of pipe having a relatively stationary article upwardly in the tubular structure. tubular structure at the bottom with a lateral 70 6. A device as described, comprising in pressure chamber, a tilting wall hook having` combination a string of drill pipe having a a pivotal mounting on the structure and havtubular structure at the bottom with an arcuing an upward extension with a piston operate pressure chamber on one side,the inside` ating in the said chamber, arcuate guides 4 of said chamber being in communication with formed in the tubular structure andy engaged 75 the inside of the structure, a pivotally by projections on the sides ofthe upper pormounted wall hook having an upward eX- tion of the wall hook, the said wall hook being tension with a piston thereon fitting in the adapted to be shifted by the internal pressure said chamber, the piston being subject diof a hydraulic fluid on the piston in the said bular structure and thereby tilting the wall In testimony whereof I have signedimy.y hook to one side, and means to limit the movename to this specification. v ment of such wall hook. CLARENCE P. YOUNG.

7 A device as claimed vin claim 6, a shiftable plug retained at the bottom of the said y 5.3

tubular structure and obstructing the flow of hydraulic fluid, whereby pressure may be created against the said piston, the plug being shiftable upwardly by an article engaged by the wall hook on lowering of the said struc- Y 9u ture and the wall hook.

8. A device as claimed in claim 6, thev tiltable wall hook having a skirt structure connected Vthereto with a reaming edge on each skirt structure, whereby the hole may be 95 reamed to allow full tilting of the wall hook to one side.

9. A device as described, comprising a string of pipe having a tubular structure at the bottom with a shiftable wall hook, a hy- 100 draulic means for moving said hook laterally, said hook having a cutting surface on the bottom to allow a cutting action on the formation. 1

10. A device as described, comprisingv a 165 string of drill pipe having a tubular structure at the bottom with an arcuate pressure chamber on one side of said structure and a shiftable plug forming a closure at the bottom, said plug having a small opening thereu@ through, a wall hook pivotally mountedv to the bottom of said structure and having kan upper back portion extending upwardly on the outside of the lower portion of the tubular structure and having a piston operating y 11;; in the said pressure chamber and a downward f extension below the pivot having an arcuate hook, means to limit the lateral movementV of the hook, such movementbeing accom- 1, plished by hydraulic pressure in the tubular .n n 12o structure, the said hook being adapted to Y f Y engage an article in a well and to shift-samek into alignment with the tubular structure, said plug being shiftable upwardly on the l y lowering of the wall hook and the said tubu- 125 `lar structure over the said article.

1l. A device as claimed in claim' 10, a flaring skirt attached to the tiltable wall hook below the pivot point of the hook with the tubular structure, said skirt having a cutting y v y )auf 

